Extended JS metrics

- [x] Activate commented out metrics (self.im.setMaxListeners(x) in self.init)
- [x] Total registered EMIS numbers . django
- [x] Total registered EMIS numbers . total
- [x] Total registered EMIS numbers . ussd
- [x] Average number of USSD sessions per user
- [x] Number of USSD sessions per province
- [x] Average USSD sessions per user needed to complete Registration (wait for helper improvement)
- [ ] Handle duplicate metric fires with Django hooks (possibly stop firing .totals in js and fire a decr for .django)
- [x] Fire two metrics on learner performance complete for boys and girls (like django)

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